The trouble with old, obsolete video tape formats is that they tend to deteriorate after many years of storage.
This 1977 Scotch 3/4″ U-Matic tape containing a video recording from the University of California has dropout problems and an edge crease from about half-way through its 50 minutes length.
Creases and dropout will often deposit gunk onto the tiny video scanning heads and drum assembly, which requires a thorough clean before transfer. That’s not such a hassle with one tape but when there’s a whole boxful to do it’s a pain performing a full clean between transfers.
Look at the technology required to perform transfer of a tape format whose maximum record time was an hour! I predict that one day we’ll be able to record and store video on tiny devices that can fit into one’s pockets. I know – I saw it on BBC1’s flagship technology show Tomorrow’s World years ago!